git: Support exception handling on statically-linked binaries
marino at crater.dragonflybsd.org
Sun Feb 5 08:33:18 PST 2012
Author: John Marino <draco at marino.st>
Date: Sun Feb 5 17:21:27 2012 +0100
Support exception handling on statically-linked binaries
The real-time dynamic linker handles exceptions on dynamically-linked
binaries through the dl_iterate_phdr function. The RTLD isn't invoked
on statically-built executables so thrown exceptions weren't getting
handled. There was a dummy dl_iterate_phdr function in libc with a
weak symbol that gets looked at when the rtld version isn't present.
This function was populated and gets called when the statically-linked
executable throws an exception.
It requires the GNU_EH_FRAME program header to be present. The base
gcc 4.4 spec file was modified to emit this header for statically-built
binaries in addition to the dynamically lined ones.
Summary of changes:
contrib/gcc-4.4/gcc/config/dragonfly.h | 3 +-
lib/libc/gen/dlfcn.c | 60 ++++++++++++++++++++++++++++++-
2 files changed, 59 insertions(+), 4 deletions(-)
DragonFly BSD source repository
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